1. National University of Science and Technology “MISiS,” Moscow 119049, Russia
2. Institute of Magnetism, 36-b, Vernadsky Str., Kyiv 03142, Ukraine
3. Donetsk Institute for Physics and Engineering, Kyiv 03028, Ukraine
4. Faculty of Radiophysics, Electronics and Computer Systems, Taras Shevchenko University, Glushkov Str. 4G, Kyiv 01601, Ukraine
5. Departament de Fisica, Universitat de les Illes Balears, Ctra. de Valldemossa, km 7.5, 07122 Palma de Mallorca, Spain